feat(recurring): accept EIP-1271 smart-account signatures

[LeoSlrRf]

Add EIP-1271 Smart Account Signature Support to ERC20RecurringPaymentProxy

Replaces the ECDSA.recover signature verification in ERC20RecurringPaymentProxy with OpenZeppelin's SignatureChecker.isValidSignatureNow, enabling subscribers to be smart contract wallets that implement EIP-1271 in addition to standard EOAs.

The signature check is extracted into a private _assertSigner helper that calls SignatureChecker.isValidSignatureNow and reverts with ERC20RecurringPaymentProxy__BadSignature on failure.

A MockERC1271 test contract is introduced to simulate a minimal smart account wallet. It implements isValidSignature by recovering the signer via ecrecover and comparing against a stored owner address, and exposes an approveToken helper so the owner can grant token allowances on behalf of the wallet.

Tests cover three scenarios:

• A valid EIP-1271 smart account signature is accepted and triggers the payment
• A malformed smart account signature is rejected
• An existing EOA signature continues to work correctly through SignatureChecker

[LeoSlrRf]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• refactor(recurring): pack schedule state into one mapping #1762
• fix(recurring): grant and revoke relayer as separate calls #1761
• feat(recurring): emit schedule and admin events #1760
• test(recurring): accept and reject EIP-1271 batch signatures #1759
• feat(recurring): add revokeCycles for admitted bits #1758
• docs(recurring): warn cancel does not drop allowance #1757
• fix(recurring): reject zero-amount legs #1756
• fix(recurring): guard rescueTokens with nonReentrant #1755
• fix(recurring): bind batch schedule key to signed terms #1754
• fix(recurring): revert on a failed or short subscriber pull #1753
• feat(recurring): accept EIP-1271 smart-account signatures #1752 👈 (View in Graphite)
• fix(recurring): emit 8-byte payment references #1751
• master

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[greptile-apps]

Greptile Summary

The PR extends recurring-payment schedule authorization to EIP-1271 smart accounts while preserving EOA signature support.

• Replaces direct ECDSA recovery with OpenZeppelin SignatureChecker.
• Adds an ERC-1271 test wallet with owner-controlled token approval.
• Adds coverage for valid and malformed smart-account signatures and the existing EOA flow.

Confidence Score: 5/5

The PR appears safe to merge with no concrete correctness or security defects identified.

The changed validation delegates to the compatible OpenZeppelin 4.9.6 checker, remains bound to the existing EIP-712 digest and subscriber, and retains the token allowance and transfer safeguards of the recurring-payment flow.

Important Files Changed

Filename	Overview
packages/smart-contracts/src/contracts/ERC20RecurringPaymentProxy.sol	Replaces EOA-only recovery with OpenZeppelin’s EOA/ERC-1271 signature checker without changing the signed digest or payment execution.
packages/smart-contracts/src/contracts/test/MockERC1271.sol	Adds a narrowly scoped ERC-1271 test wallet that validates owner signatures and permits owner-controlled ERC-20 approvals.
packages/smart-contracts/test/contracts/ERC20RecurringPaymentProxy.test.ts	Covers valid and malformed smart-account signatures and confirms that EOA signatures remain accepted.

Sequence Diagram

sequenceDiagram
  participant R as Authorized Relayer
  participant P as Recurring Payment Proxy
  participant W as Subscriber / ERC-1271 Wallet
  participant T as ERC-20 Token
  R->>P: triggerRecurringPayment(permit, signature, index)
  P->>P: Compute EIP-712 schedule digest
  alt Subscriber is an EOA
    P->>P: Recover and compare signer
  else Subscriber is a smart account
    P->>W: isValidSignature(digest, signature)
    W-->>P: ERC-1271 magic value
  end
  P->>T: transferFrom(subscriber, proxy, total)
  P->>T: Route payment, fee, and relayer fee

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